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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Income Tax Disclosure [Abstract]          
Effective income tax 39.50% 39.90% 36.60% 39.90%  
Deferred tax assets, net $ 1,195,905   $ 1,195,905   $ 1,394,879
Gross unrecognized tax benefits 22,100   22,100   39,000
Accrued interest and penalties on unrecognized tax benefits 12,100   12,100   $ 17,200
Possible decrease in unrecognized tax benefits $ 18,000   $ 18,000